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ManagementKeyAttribute Class

The ManagementKey attribute identifies the key properties of a WMI class.

System.Object
  System.Attribute
    System.Management.Instrumentation.ManagementMemberAttribute
      System.Management.Instrumentation.ManagementKeyAttribute

Namespace:  System.Management.Instrumentation
Assembly:  System.Core (in System.Core.dll)

[AttributeUsageAttribute(AttributeTargets.Property|AttributeTargets.Field, AllowMultiple = false)]
[HostProtectionAttribute(SecurityAction.LinkDemand, MayLeakOnAbort = true)]
public sealed class ManagementKeyAttribute : ManagementMemberAttribute

The ManagementKeyAttribute type exposes the following members.

  NameDescription
Public methodManagementKeyAttributeInitializes a new instance of the ManagementKeyAttribute class. This is the default constructor.
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  NameDescription
Public propertyNameGets or sets the name of the management attribute. (Inherited from ManagementMemberAttribute.)
Public propertyTypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
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  NameDescription
Public methodEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Public methodGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodIsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public methodMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Explicit interface implemetationPrivate method_Attribute.GetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.InvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)
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Unless a WMI class is a singleton, it can have multiple corresponding instances. Clients of the class must be able to uniquely identify the specific instance they are interested in. So, as a provider writer, you must choose a property or set of properties that uniquely identify an instance of each of your WMI classes. You use the ManagementKeyAttribute attribute to identify those key properties. Properties identified as keys have the same runtime behavior as read-only properties indicated by the ManagementProbeAttribute attribute.

NoteNote

The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: MayLeakOnAbort. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

The following example shows how to use the ManagementKeyAttribute to mark a field as a key property of a WMI class.

[ManagementKey]
public int id;

The next example shows how to use the ManagementKeyAttribute attribute to mark a key property of a WMI class.

[C#]

// Use the ManagementKey attribute to specify that this property 
// is used as the key identifier of this class and for the WMI
// instances of this class.  This property must be unique for each
// class instance.
[ManagementKey]
public int Id
{
    get { return System.Diagnostics.Process.GetCurrentProcess().Id; }
}

.NET Framework

Supported in: 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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